Michigan State University. Agricultural Experiment Station. (1998). Michigan field crop ecology: Managing biological processes for productivity and environmental quality. Michigan State University Michigan Agricultural Experiment Station.
Παραπομπή σε μορφή Chicago (17η εκδ.)Michigan State University. Agricultural Experiment Station. Michigan Field Crop Ecology: Managing Biological Processes for Productivity and Environmental Quality. [East Lansing, Mich.]: Michigan State University Michigan Agricultural Experiment Station, 1998.
Παραπομπή σε μορφή MLA (9th εκδ.)Michigan State University. Agricultural Experiment Station. Michigan Field Crop Ecology: Managing Biological Processes for Productivity and Environmental Quality. Michigan State University Michigan Agricultural Experiment Station, 1998.